American Heritage Dictionary
(1)
Century Dictionary
(1)
GNU Webster's 1913
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WordNet
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Elsewhere on the web
Sleep apnea is a painful and arduous sleeping disorder that affects many adults.— Find Free Articles - ArticlesBase
"If you snore and you have sleep apnea -- when you stop breathing at night for 10 seconds or longer -- the risk of heart disease is real," says Dr. Snyderman.— AOL News
Obstructive Sleep apnea is a risk factor for stroke and sudden death during sleep.— Medindia Health News

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a month.
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